Support arm for device holder



FIG. 1 is a perspective view of a support arm for device holder showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is a rear perspective view thereof; and,

FIG. 9 is another front perspective view thereof, but shown with broken line environmental subject matter, and in a position of use.

The broken lines illustrate the environment of the article and form no part of the claimed design. 

CLAIM The ornamental design for a support arm for device holder, as shown and described. 